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Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at 298.15 K and the application of ion-interaction model

Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Fei Yuan Long Li Yafei Guo Yuanhui Liu Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology

Boron and its compounds play an important role in modern energy and material sciences including permanent magnetic,superconducting,boride cermets,boron-based fuel-rich propellants and borate whisker materials. Lithium metaborate is a high-quality piezoelectric material for mobile communication,and lithium pentaborate can be used as a high quality laser material and so on. In order to establish the thermodynamic model of brine systems and to utilize the valuable salt lake resources effectively and comprehensively,heat enthalpy knowledge on the salt lake system containing lithium and borate ions is of great significance not only to understand the ion-interaction between solute-solvent and solute-solute as well as the effects of ion strength,temperature on excess free energy,but also to provide fundamental data in predicting the crystallizing and evaporating behaviors of these salt lakes. Studies on the thermodynamic properties of the salt lake brine systems containing lithium and borate ions is of great significance to establish the solubility predictive model of electrolytes to promote the industrial exploitation of those valuable salt lake resources effectively and *** dilution enthalpies of LiBO (aq) from 0.1 to 0.8 mol·kg and LiBO (aq)from 0.3 to 0.9 mol·kg at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT *** apparent molar enthalpies on the two species of lithium borates were obtained on the basis of experimental data,and then the diagrams of their apparent molar enthalpy against molality for LiBO (aq) and LiBO (aq) were also *** to Pitzer ion-interaction equations,the Pitzer single-salt parameters (β(0)L),β(1)L),β(2)L),C) for LiBO and Li BO were obtained,which are not reported in the *** calculated apparent molar enthalpies for Li BO (aq) and LiBO(aq) agree well with the experimental values,which indicate that the Pitzer single parameters of Li BO and LiBO obtain are reliable.

关键词： Thermal analysis,Thermodynamics,Dilution enthalpy apparent molar enthalpy Pitzer model Lithium metaborate lithium pentaborate

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